Sampling and counting system

a sampling system and counting technology, applied in the direction of instruments, suspensions, porous material analysis, etc., can solve the problems of inaccurate and disputed counts, inability to accurately determine the dilution factor, etc., to achieve the effect of improving the dilution and sampling system

Inactive Publication Date: 2014-11-04
UNITED STATES OF AMERICA
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Benefits of technology

[0009]A system for testing the efficiency of a test HEPA filter includes improved dilution and sampling systems. The dilution system processes samples collected upstream of the test HEPA filter. The dilution system has a test portion and a calibration portion. The calibration portion aids in determining the dilution ratio of the test portion thereby rendering the dilution system self-calibrating, and allowing an accurate particle count upstream and downstream from the test HEPA filter. The sampling system receives upstream samples via the dilution system, and downstream samples collected directly

Problems solved by technology

As noted in U.S. Pat. No. 7,536,898 issued to Owen, when particle counters measure aerosol concentrations above their operating range, the detectors can become saturated or exhibit undesirable nonlinear behavior.
The drawback from these measurement devices arises when they ar

Method used

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Embodiment Construction

[0017]This invention is directed to a high flow rate self-calibrating aerosol dilution device, and a sampling system for providing particulate samples to a particle counter. The invention can be used for testing High-Efficiency Particulate Air (HEPA) filters by collecting samples up and downstream of the HEPA filter under test and comparing upstream and downstream sample counts to calculate HEPA filter efficiency.

[0018]For the purposes of this invention disclosure, the terms “line” and “pathway” are regarded as equivalent terms; in addition, the terms “particle measuring system” and “particle counter” are regarded as equivalent terms.

[0019]Broadly, the invention is a system for testing the efficiency of a test HEPA filter. The testing system comprises improved dilution and sampling systems for particular use with a new generation of highly accurate static particle counters, typically used to count particles in clean rooms and the like. The dilution system is capable of test and self...

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Abstract

A system for testing the efficiency of a test HEPA filter, the system comprises a dilution system and a sampling system. The dilution system processes samples collected upstream of the test HEPA filter. The dilution system has a test portion and a calibrated portion. The calibrated portion aids in determining the dilution ratio of the test portion thereby rendering the dilution system self-calibrating. The sampling system receives upstream samples via the dilution system, and downstream samples collected directly downstream of the test HEPA filter. The sampling system incorporates a flow rate balancing system to ensure accurate counts with respect to samples collected upstream and downstream of the test HEPA filter. The sampling system works well with particle counters fitted with relatively weak fans to draw in samples for counting; this is achieved by connecting the sampling system to both the inlet and exhaust outlet of a particle counter.

Description

GOVERNMENT INTEREST[0001]The invention described herein may be used, manufactured, and licensed by or for the United States Government.FIELD OF THE INVENTION[0002]This invention relates to a high flow rate self-calibrating aerosol dilution device, and a sampling system for providing particulate samples to a particle counter. The invention can be used for testing High-Efficiency Particulate Air (HEPA) filters by collecting samples up and downstream of the HEPA filter under test and comparing upstream and downstream sample counts.BACKGROUND OF THE INVENTION[0003]As noted in U.S. Pat. No. 7,536,898 issued to Owen, when particle counters measure aerosol concentrations above their operating range, the detectors can become saturated or exhibit undesirable nonlinear behavior. The drawback from these measurement devices arises when they are used to measure aerosol concentrations above the instrument's dynamic range.[0004]To overcome this obstacle, dilution techniques have been employed wher...

Claims

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Application Information

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IPC IPC(8): G01N1/26
CPCG01N1/2205G01N1/26G01N15/08G01N2015/084G01N1/2273
Inventor MANCINHO, DEREK J.WIN, MYAT S.
Owner UNITED STATES OF AMERICA
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